EXPERIMENT STATION REPORT 



249 



size of seed and size of fruit; correlation between the amount of 

 "flesh" and size of fruit; and correlation between color of vine 

 and color of fruit. 



The work of the past season consisted chiefly in further study 

 of the influence of crossing and continual selection upon shape, 

 color and surface characteristics. A study was also made of 

 blends as related to their parents with the aim of finding out the 

 characteristics existing among squashes and their relation to each 

 other. 



CROSSING AND CONTINUED SELECTION TO ESTABLISH CROSS. 



Squashes, from the ease with which they wide-fertilize, due to 

 unisexual flowers and great attractiveness for insects, are ordi- 

 narily not uniform in their characteristics. Even old commercial 

 varieties of squashes often produce many types of fruits. Crosses 

 between distinct varieties are established with much difficulty. 

 For example, some of the crosses made in 1903 were subjected 

 to continual selection at once ; others were crossed again the fol- 

 lowing year and then subjected to continual selection. The 

 selection consisted in growing seeds from desirable fruits formed 

 by pollinating within the plant, for which the initials W. P. are 

 used, or between plants of the same cross (W. C). 



Below is given a list of crosses showing the stages of varia- 

 bility through four years of selection. The "selection" of one 

 year becomes the "progeny" of the next. 



1905. 



Cross. 



Progeny. 



Selection. 



" Yellow " Jugs ' ' more numerous than 



Crookneck// flat, chiefly cream, some 

 Cream Scallop/ yellow and striped, slightly 

 Yellow Crook- warty, 

 neck" (5// 6/ 5) 



1906. 



Generally smooth "jugs" 

 not fluted, variable color. 



(1) Warty "jug," fluted, W. P. 



(2) Warty "jug," fluted, W. C. 



(1) Orange green, smooth jug, 



not fluted, W. P. 



(2) Smooth green "jug," not 



fluted, W. C. 



(3) Smooth cream ".jug," flu- 



ted, W. P. 



